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The Web Modeling Language (WebML) is a third-generation Web design methodology, conceived in 1998 in the wake of the early hypermedia models and the pioneering works on hypermedia and Web design, like HDM (Garzotto et al., 1993) and RMM (Isakowitz et al., 1995). The original goal of WebML was to support the design and implementation of so-called dataintensive Web applications (Ceri et al., 2002), defined as Web sites for accessing and maintaining large amounts of structured data, typically stored as records in a database management system, like online trading and ecommerce applications, institutional Web sites of private and public organizations, digital libraries, corporate portals, and community sites. To achieve this goal, WebML reused existing conceptual data models and proposed an original notation for expressing the navigation and composition features of hypertext interfaces. WebML’s …